I have been added support for configuring fields in a schema. For example you can now set a default value for string, or the minimum and maximum value of a slider.
This new code is, where possible, written in vala, the language I originally wanted to write stuffkeeper in.
My plan is to code new code, if possible, in vala and slowly move old code over.
p.s. screenshot of the ability to configure a slider: (yeah dialog needs rethinking in terms of layout)